In the LabChart Spirometry module, what is the definition for the Dead Air Space (DAS) volume correction factor?

The dead space air (DAS) volume is the total volume of air in the tubing of the apparatus; plus, the air that is not normally heated by the body (air in mouth, throat, etc.). 

For humans, a DAS value of 400mL is typical. This would be an estimation based on using our Human Respiratory Kit (PTK10). However, when using our Metabolic setup with longer bore tubing sizes such as 180 cm then we recommend calculating your own Dead Space. Remember to use cylinder volume calculations to derive this. 

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